<!DOCTYPE html>
<html>
  <head>
    <title>open Mul-instance</title>
  </head>
  <body>
    <h1>open Mul-instance</h1>
    We are using node.js 
    <script>
      var gui = require('nw.gui');
      var fs = require('fs');
      fs.appendFileSync('msg', '1');
      setTimeout(function() {
         gui.App.quit();
      }, 2000);

    </script>
  </body>
</html>
